Engineering Materials Practice Set-8

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1. Tungsten in high speed steel provides

Sharp cutting edge

Toughness

Hot hardness

Wear resistance

2. Sulphur in cast iron

Increases hardness and brittleness

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Make the iron white and hard

3. Manganese in steel increases its

Ductility

Fluidity

Tensile strength

Hardness

4. Nimonic contains __________ percentage of nickel as that of Inconel.

Less

More

None of these

Same

5. Chromium in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves wear resistance, cutting ability and toughness

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves cutting ability and reduces hardenability

6. Connecting rod is usually made of

Aluminium

Low carbon steel

Medium carbon steel

High carbon steel

7. Hardness of upper bainite (acicular structure) is about

RC 57

RC 65

RC 48

RC 80

8. The hardness of steel increases if it contains

Cementite

Austenite

Pearlite

Martensite

9. The alloy used for making electrical resistances and heating elements is

Nichrome

Invar

Elinvar

Magnin

10. The hardness is the property of a material due to which it

Can be drawn into wires

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

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11. Cupola produces following material

Malleable iron

Pig iron

Wrought iron

Cast iron

12. The machinability of steel is increased by

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous, lead and sulphur

Phosphorous and aluminium

13. Permalloy is a

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

Kind of stainless steel

14. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Stainless steel

Mild steel

15. Preheating is essential in welding

High speed steel

Cast iron

All nonferrous materials

All of the above

16. Gun metal contains

70 - 78% copper and rest tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

17. Shock resisting steels should have

Toughness

Low hardness

Low wear resistance

Low tensile strength

18. The presence of sulphur in pig iron makes

It hard

It brittle

It easily machinable

The casting unsound

19. Argentite is the principal ore or raw material for

Silver

Aluminium

Zinc

Tin

20. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

710

35

1015

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21. Cold rolled steel sheets contain carbon of the following order

0.6%

0.4%

0.1%

0.2%

22. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Chromium

Manganese

Nickel

23. Which is false statement about tempering? Tempering is done to

Improve machinability

Release stresses

Improve ductility

Improve toughness

24. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

25. Beryllium bronze has

(A) High yield point

(D) None of these

(B) High fatigue limit

(C) Both (A) and (B)

26. Which of the following is the binding material in cemented carbides?

Vanadium

Iron

Cobalt

Nickel

27. Free cutting steels

Require least cutting force

Are used where ease in machining is the criterion

Contain carbon in free form

Do not exist

28. Aluminium bronze contains aluminium and copper in the ratio of

50 : 50

10 : 90

60 : 40

40 : 60

29. An example of amorphous material is

Lead

Silver

Glass

Zinc

30. High carbon steel carries carbon percentage

0.6 to 0.8%

0.3 to 0.6%

0.1 to 0.3%

0.8 to 1.5%

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31. Melting point of iron is

1601°C

1489°C

1539°C

1712°C

32. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

Intermetallic compounds

All of the above

33. Delta metal is an alloy of

Iron, nickel and copper

Copper, zinc and iron

Iron, aluminium and magnesium

Iron, lead and tin

34. Steel made from phosphate iron is

Hard

Brittle

Ductile

Tough

35. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and iron

Nickel, copper and zinc

Iron, zinc and bismuth

36. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.1 to 0.2%

0.25 to 0.5%

0.7 to 0.9%

37. Which of the following is used for bearing liner?

Babbitt metal

Bell metal

Bronze

Gun metal

38. Bronze contains

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

70 - 75% copper and rest tin

39. Phosphor bronze contains

1% phosphorous

None of the above

0.5% of phosphorous

2.5% phosphorous

40. The crystal structure of brass is

H.C.P.

F.C.C.

Orthorhombic crystalline structure

B.C.C.

Engineering Materials Practice Set-8

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